[issue17636] Modify IMPORT_FROM to fallback on sys.modules

[Nick Coghlan]

Nick Coghlan added the comment:

The language reference - at least the section on the import statement, and potentially the section on the overall operation of the import system.

I don't *think* it would affect anywhere in the tutorial or the importlib docs, but they may be worth skimming to see if anything leaps out.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17636>
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